Olivia had multiple injuries on her arms, face and head, according to an affidavit. Medics rushed her to University Hospital, where she was pronounced dead the following day, police said.

When police interviewed the mother, she told them Olivia was vomiting and would not wake up that morning. Briones told police she researched causes of vomiting and found that head trauma is a possible cause, authorities said.

Briones allegedly admitted to slamming the door on Olivia's arm, but claimed it was accidental. She also told police Olivia falls often, and most recently hit her head on the floor on Sept. 1. However she told police she couldn't explain why Olivia's head trauma was so severe, according to the affidavit.

Briones also told police she had taken her daughter to the substation rather than calling 911 because she didn't know where her phone was and was low on minutes.

Doctors at the hospital found multiple bleeding sites inside the child's head and severe brain swelling, consistent with a strike to the head, according to the affidavit.

The medical examiner's office determined that Olivia had a swollen nose, 8 scars on her scalp, a large abrasion on the back of her head, a black eye, a deflated left lung, a fractured vertebrae, a swollen wrist and two swollen arms, a bruised ankle and tissue in her upper lip was detached from her gums.

The cause of death is still pending, according to the medical examiner's office.

The district attorney's office could file upgraded charges depending on the medical examiner's findings.

If convicted of injuring her daughter, Briones faces up to 99 years of prison.